A direct one-pot route for the synthesis of 2,2-dimethyl-2H-chromenes by Re(CO)5Cl-catalyzed cyclocondensation of phenols with 2-methyl-3-butyn-2-ol has been developed. The easy availability of starting materials, mild reaction conditions, high atom-efficiency, and the use of a recoverable catalyst are advantages of this procedure.
已开发出一种直接一锅法,该方法通过Re(CO)5 Cl催化
苯酚与
2-甲基-3-丁炔-2-醇的环缩合反应合成2,2-二甲基-2 H-色烯。起始原料容易获得,反应条件温和,原子效率高以及可回收催化剂的使用是该方法的优势。